Muscle Moments 1. For the given muscle force vs joint angle plot and moment arm
ID: 3511102 • Letter: M
Question
Muscle Moments 1. For the given muscle force vs joint angle plot and moment arm vs joint angle plot, sketch what the resulting moment vs joint angle plot would look like. Note: I am looking for the general resulting shape, not an exact result Peak Musde Forde Maximum Moment Am 100 100- 75 75 25 50 100 100 200 Joint Angle (degrees) Joint Angle (degrees) 2. True or False: Muscles with large moment arms undergo a larger change in length with joint rotation. 3. If two muscles produce the same force and shorten at the same rate, the muscle with the larger moment arm will produce a greater/lesser (circle one) moment and will produce faster/slower (circle one) movement.Explanation / Answer
Answer 1. Moment vs joint angle plot will look like something close to shape of arm moment vs joint angle plot because these are equivalent situations. Moment start with some amount of muscle forces.
Answer 2. True. Muscles with large moment arm undergo a larger change in length with joint rotation. Because muscle moments are as important as the muscle force in generating the torque of the joint.
Answer 3. By using the equation, joint torque= muscle force × muscle moment arm length. So the muscles with same force, the muscle having more moment arm length will produce more joint torque. Muscles with larger moment arm will produce Greater and faster movement.
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